[Bug 242828] diff -rq still does full file comparison

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242828

--- Comment #2 from fehmi noyan isi <fnoyanisi at yahoo.com> ---
I think adding one _if_ check to the case where the files differ would be
sufficient;

        switch (files_differ(f1, f2, flags)) {
        case 0:
                goto closem;
        case 1:
                /* if brief output is needed, just return to the caller */
                if (diff_format == D_BRIEF) {
                        rval = D_DIFFER;
                        goto closem;
                }
                break;
        default:
                /* error */
                status |= 2;
                goto closem;
        }

with this change, when -q or --brief is used, diff(1) will just print a message
without doing any further work

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